Titre : |
New standard for wood coatings : 2K water-borne polyurethane systems without sacrificing drying time |
Type de document : |
texte imprimé |
Année de publication : |
2019 |
Article en page(s) : |
p. 20-25 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Bois -- Revêtements protecteurs Polyisocyanates hydrophiles Polyuréthanes Réticulants Revêtements bi-composant Revêtements en phase aqueuse -- Additifs Revêtements organiques
|
Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
Around 40% of the global industrial wood coatings market is based on traditional solvent-borne polyurethane technology. Water-borne polyurethane systems are high performance and en-vironmentally compatible but their in-herently slower drying has limited the market shift towards this low emission alternative. A novel hybrid hydrophilic polyisocyanate offers a fast-drying and promising solution. |
Note de contenu : |
- Hardener is key to developing fast crosslinkers
- Novel HDI-TDI hardener for faster curing of 2K WB systems
- Anionic hydrophilisation proves effective
- Aromatic content
- Faster cure with minimal compromise
- Drying time comparable to 2K SB standard
- More environmentally friendly solutions now possible
- Fig. 1 : Gloss and haze of two different 2K WB systems based on standard hydrophilic polyisocyanate or the novel H01/1-131 based one
- Fig. 2 : Drying lime comparison at room temperature [23°C, 50 % RH) of different 2K WB coatings (based on secondary and pri¬mary acrylic polyol and two different hardeners) according to OIN 53150, 120 g/m2 on glass. Total dry [TLI] of 2K WB systems can be reduced by half compared to a standard system when using the novel hardener
- Fig. 3 : Hardness evolution of coatings based on different polyols combined with bath hardeners. New development shows faster hardness evolution Chan homologue HDI type
- Fig. 4 : Drying and hardness evolution of coatings based on OH-functional PUD and different hardeners. The novel PIC shows (aster hardness evolution Chan homologue HDI type
- Fig. 5 : Comparison of yellowing under natural light [under glass 45-e oriented south] from coatings based on new hardener and standard types [aliphatic and aromatic]
- Table 1 : Technical data of novel aliphatic-aromatic hydrophilic polyisocyanate
- Table 2 : Effect of increasing aromatic content [from left to right] in hydrophilic polyisocyanates on 2K WB coating based on second¬ary acrylic polyol and different hardeners
- Table 3 : Comparison of different coahing properhies based on novel hardener vs. standard 2K 5B formulation |
En ligne : |
https://drive.google.com/file/d/1-V4_TKhiqBCxfpPzw777iAw0337-4o6N/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32905 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 9 (09/2019) . - p. 20-25